这是HDL指南的ISE文档集的一部分。如果你喜欢工作与原理图，本指南的一个单独的版本是可用的。Xilinx 7 Series FPGA Libraries Guide for HDL Designs UG768 (v 13.2) July 7, 2011 Xilinx is disclosing this user guide, manual, release note, and/or specification (the “Documentation”) to you solely for use in the development of designs to operate with Xilinx hardware devices. You may not reproduce, distribute, republish, download, display, post, or transmit the Documentation in any form or by any means including, but not limited to, electronic, mechanical, photocopying, recording, or otherwise, without the prior written consent of Xilinx. Xilinx expressly disclaims any liability arising out of your use of the Documentation. Xilinx reserves the right, at its sole discretion, to change the Documentation without notice at any time. Xilinx assumes no obligation to correct any errors conta……